Submission #711271

#	Time	Username	Problem	Language	Result	Execution time	Memory
711271		groshi	One-Way Streets (CEOI17_oneway)	C++17	100 / 100	133 ms	20044 KiB

oneway

#include<bits/stdc++.h>

using namespace std;
struct wi{
    vector<int> Q,Q2;
    int pocz=0,kon=0;
    int most=0;
    int low=0;
    bool odw=0;
    int pree=0;
    bool odw2=0;
    int nr_do_ojca=0;
    int odw3=0;
}*w;
int t[200000][2];
string wypisz="";
int pre=1;
void reku(int x,int ojc,int jaka)
{
    w[x].odw=1;
    w[x].pree=pre;
    w[x].low=pre;
    pre++;
    for(int i=0;i<w[x].Q.size();i+=2)
    {
        int pom=w[x].Q[i];
        if(w[x].Q[i+1]==jaka)
        continue;
        if(w[pom].odw==1)
            w[x].low=min(w[x].low,w[pom].pree);
        else{
            reku(pom,x,w[x].Q[i+1]);
            w[x].low=min(w[x].low,w[pom].low);
            if(w[pom].low>w[x].pree)
                w[w[x].Q[i+1]].most=1;
        }
    }
}
int reku2(int x,int ojc)
{
    w[x].odw2=1;
    int mam=w[x].pocz;
    for(int i=0;i<w[x].Q2.size();i++)
    {
        int pom=w[x].Q2[i];
        if(w[pom].odw2==0)
            mam+=reku2(pom,x);
    }
    if(x!=ojc)
    {
        if(mam<0)
        {
            if(w[w[x].nr_do_ojca].most==1)
            {
                if(t[w[x].nr_do_ojca][0]==x)
                    wypisz[w[x].nr_do_ojca-1]='L';
                else wypisz[w[x].nr_do_ojca-1]='R';
            }
        }
        else if(mam>0)
        {
            int mam=w[x].nr_do_ojca;
            if(w[mam].most==1)
            {
                if(t[mam][0]==x)
                    wypisz[mam-1]='R';
                else wypisz[mam-1]='L';
            }
        }
    }
    return mam;
}
void reku3(int x,int ojc)
{
    w[x].odw3=1;
    for(int i=0;i<w[x].Q.size();i+=2)
    {
        int pom=w[x].Q[i];
        if(pom==ojc)
            continue;
        if(w[pom].odw3==1)
            continue;
        w[x].Q2.push_back(pom);
        w[pom].nr_do_ojca=w[x].Q[i+1];
        reku3(pom,x);
    }
}
int32_t main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    //freopen("test.in", "r", stdin);
    int n,m,x,y;
    cin>>n>>m;
    w=new wi[max(n,m)+3];
    for(int i=1;i<=m;i++)
    {
        cin>>x>>y;
        w[x].Q.push_back(y);
        w[y].Q.push_back(x);
        w[x].Q.push_back(i);
        w[y].Q.push_back(i);
        t[i][0]=x;
        t[i][1]=y;
        wypisz+="B";
    }
    for(int i=1;i<=n;i++)
        if(w[i].odw3==0)
            reku3(i,0);
    vector<int> poczatki;
    for(int i=1;i<=n;i++)
        if(w[i].odw==0)
            reku(i,0,0),poczatki.push_back(i);
    int zap;
    cin>>zap;
    while(zap--)
    {
        cin>>x>>y;
        w[x].pocz++;
        w[y].pocz--;
    }
    for(int i=0;i<poczatki.size();i++)
        int e=reku2(poczatki[i],poczatki[i]);
    cout<<wypisz;
    return 0;
}

Compilation message (stderr)

oneway.cpp: In function 'void reku(int, int, int)':
oneway.cpp:24:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |     for(int i=0;i<w[x].Q.size();i+=2)
      |                 ~^~~~~~~~~~~~~~
oneway.cpp: In function 'int reku2(int, int)':
oneway.cpp:43:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |     for(int i=0;i<w[x].Q2.size();i++)
      |                 ~^~~~~~~~~~~~~~~
oneway.cpp: In function 'void reku3(int, int)':
oneway.cpp:76:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |     for(int i=0;i<w[x].Q.size();i+=2)
      |                 ~^~~~~~~~~~~~~~
oneway.cpp: In function 'int32_t main()':
oneway.cpp:123:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  123 |     for(int i=0;i<poczatki.size();i++)
      |                 ~^~~~~~~~~~~~~~~~
oneway.cpp:124:13: warning: unused variable 'e' [-Wunused-variable]
  124 |         int e=reku2(poczatki[i],poczatki[i]);
      |             ^

• Subtask 1: 30 / 30
• Subtask 2: 30 / 30
• Subtask 3: 40 / 40